Related Manuals for GasTech D-Guard2S
Summary of Contents for GasTech D-Guard2S
- Page 1 Digital Gas Detector with Sounder Strobe OPERATOR’S M ANUAL +61 8 6108 0000 info@gastech.com gastech.com...
- Page 2 D-Guard This Page Left Intentionally Blank...
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Page 3: Table Of Contents
PRODUCT MARKINGS ..........................9 RECEIVING AND STORAGE ........................10 4.1..............................10 ECEIVING 4.2............................... 10 NSPECTION 4.3..............................10 TORAGE GASTECH AUSTRALIA CONTACT DETAILS ....................10 GENERAL SAFETY PRACTICES ........................ 11 6.1..........................11 ELEVANT ERSONNEL 6.2..........................11 AFETY OMMUNICATION 6.3. - Page 4 D-Guard 11.2..........................29 CREEN EATURES 11.2.1 User Menu status ........................... 29 11.3................ 30 ONFIGURATION AND ALIBRATION AVIGATION YSTEM 11.3.1 Soft-Key Functions and Icons ......................30 11.3.2 Quick-Nav Function ........................31 11.3.3 Entering The Function Screens......................31 CALIBRATION ............................32 12.1.
- Page 5 D-Guard 14.1.2 Detector Fault - Detector Over-Range .................... 47 14.1.3 Detector Fault - Detector Under-Range ..................47 14.1.4 Detector Fault – Upper Operating Temperature ................48 14.1.5 Detector Fault – Lower Operating Temperature ................48 14.1.6 Detector Fault – Sensor Presence Failure ..................48 14.1.7 Detector Fault –...
- Page 6 D-Guard APPENDIX G: ............................63 24.1........................... 63 YSTEM APPENDIX H: ............................64 25.1........................64 ERFORMANCE PECIFICATIONS 25.1.1 General Specifications ........................64 25.1.2 Methane Detector Specifications ....................64 25.1.3 Carbon Dioxide Detector Specifications ..................65 25.1.4 Electro-Chemical Detector Specifications ..................65 25.1.5 Mechanical &...
- Page 7 TRADEMARK STATEMENT Protected through use and/or registration in the United States and many foreign countries are the trademarks and service marks of Gastech. The use of the ® symbol indicates registration in the United States only and the “ ” is in Australia; registrations may not have been issued at present in other countries. All other product names and logos are trademarks of their respective owners.
- Page 8 If you wish to set a limit to the authorised repair cost, state a “not to exceed” figure. Gastech’s policy is to perform all needed repairs to restore the instrument to full operating condition, including reactivation or replacement of all out-of-warranty electrochemical cells.
- Page 9 1. Consumers have the benefit of conditions and warranties implied by the Trade Practices Act 1974 (TPA) and similar provisions of State and Territory enactments and nothing in these conditions is intended to exclude, restrict or modify any statutory obligation of GASTECH PTY LTD (Company) if that cannot lawfully be effected.
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Page 10: Manual Conventions
D-Guard Manual Conventions D-Guard is designed to detect, depending upon which sensor type is fitted, flammable gases and vapours, oxygen concentration or toxic gases. The detector is intended to signal one or more warnings before gas concentrations reach dangerous or harmful levels. In order to ensure that the detector's intended function will operate as designed, it is essential that the information and instructions presented in this manual are read and understood prior to installing, using or maintaining the equipment. -
Page 11: Limitations Of Use
D-Guard 2. Limitations of Use D-Guard G, D-Guard R and D-Guard S Detectors:- Can NOT be used in Group I hazardous area applications. Can NOT be used in Group IIC hazardous area applications. Can NOT be used in Group IIB hazardous area applications. Can be used in conjunction with other equipment as part of a safety instrumented system for the purposes of risk reduction. -
Page 12: Product Markings
D-Guard 3. Product Markings The D-Guard G, D-Guard R and D-Guard S Gas detectors are designed for use in general purpose non-certified applications only. Their suitability for use in any particular application depends on the product variant and the sensor type fitted. The detectors carry the following information as part of its serial number identification label: These makings provide information identifying the gas type, serial number and its IP rating. -
Page 13: Receiving And Storage
Equipment that is found to be damaged or appears to have been modified in any manner must not be used. Please contact Gastech if the equipment is suspected to be different than that ordered or if it does not match the published specifications. -
Page 14: General Safety Practices
Experience in the use of, and a technical understanding of this equipment is essential for its safe installation, operation, maintenance and removal from an application. If in doubt, seek advice from a supervisor and/or contact Gastech immediately. Mechanical, electrical installation and maintenance of plant and equipment, must only be carried out by... -
Page 15: Introduction
End users may change the gas measurement range and displayed gas name via the configuration menus and / or HART communications, however Gastech will not accept responsibility for, nor accept liability for damage or injury caused by instruments rendered unsuitable for any particular application following such changes. -
Page 16: Contents Of D-Guard-2 Package
Gas Detector assembly. User Manual. Combined enclosure / splashguard key and calibration magnet. Manufacturing Quality certificate. If the received package is incomplete, please contact Gastech or the distributor that supplied the product. Refer to Section 4 for unpacking and storage information. -
Page 17: Product Description
D-Guard 8. PRODUCT DESCRIPTION 8.1. Product Function The D-Guard smart Gas detector’s function is to detect the presence of gas (or reduction in oxygen concentration) in the environment immediately surrounding it. Such gases may be toxic, flammable or asphyxiant, where concentrations may exceed safe exposure limits for occupants or combust in the presence of ignition sources. -
Page 18: Installation
Gastech applications engineer. Ensure that the application into which the detector is to be installed is correctly understood. -
Page 19: General Installation Practices
D-Guard 9.2. General Installation Practices Before starting the installation process, read this operational manual thoroughly, making particular note to any aspects that could affect the reliability or accuracy of D-Guard . It is essential that the operational specifications for the instrument are understood in relation to compatibility with the rest of the system. Refer to Appendix C for information regarding sensor basics, chemical compatibility and cross-sensitivity. -
Page 20: Installation Considerations
If any damage is evident to any part of the detector electronics or enclosure system, it must not be used. If such damage is present, advice from Gastech should be sought to remedy the problem before proceeding. -
Page 21: Mounting The Enclosure
D-Guard 9.5. Mounting the Enclosure The D-Guard enclosure provides two mounting feet that are external to the enclosure. These are located to the left and right of the instrument and can accommodate screw/bolt sizes up to M8. 9.5.1 Mounting Surfaces and Environment The surface that the detectors are to be mounted to should be as flat as possible to provide stable, secure fixing. -
Page 22: Detector Location
D-Guard 9.5.2 Detector Location Although over time, gas released into a space will expand to uniformly fill it with equal concentration, in many practical applications, there exists the possibility of pooling due to areas that have little or no ventilation or natural movement of air. -
Page 23: Electrical Connections
D-Guard 9.6. Electrical Connections D-Guard requires only two connections to be made in order for it to function. These two connections convey input power and return the process related current signal. The functions of both power supply and signalling are therefore carried out over the same pair of wires. For D-Guard variants with HART communications, the digital signal also uses the same two wire connections. -
Page 24: Connection Details
D-Guard 9.6.2 Connection Details Connection Directly To System PCB: Cable Plug Positive Supply Input (V+) Loop Return (V-) Connection Function Positive Supply Voltage Input Loop Return (V-) Current Loop Output Signal / Supply Return Shield Noise Protection. Connected to Enclosure. Connection To Terminal Board Positive Supply Input (V+) Cable Shield or Connection to System Earth... -
Page 25: Conductor Preparation
D-Guard 9.6.4 Conductor Preparation The ends of the conductors to be fitted into the power plug, must be properly terminated with suitable ferules (bootlace or flat-blade). The supplied power plug will accept terminations with a cross sectional area between 0.2mm and 2.5mm It is not advisable to simply strip the conductors and place the un-terminated ends into the power plug, as this is likely to fail over time. -
Page 26: Cable Gland
D-Guard 9.6.6 Cable Gland The cable gland fitted to the D-Guard detectors is a 20mm type rated to IP66 and IP68. The gland rating is matched to the enclosure in terms of protection against moisture ingress. In order to maintain the integrity of the detector housing, it is vital that the cable gland is used properly. -
Page 27: Commissioning
D-Guard Commissioning Once D-Guard-2 has been mounted and electrically connected, it must be commissioned. Commissioning of the monitoring system to which D-Guard-2 is connected is beyond the scope of this manual since specific methods will depend upon the details of the installation. There are nonetheless, common considerations to make in the processes of testing newly installed gas detectors. -
Page 28: Performance Checks
These tests must only be performed by suitably trained personnel. Gastech makes the assumption that personnel carrying out any procedure given in this manual are fully competent in the handling and use of toxic gases, gas cylinders, regulators and piping/hoses. -
Page 29: Bump Test Conditions
D-Guard 10.4. Bump Test Conditions Bump tests must be carried out with the detector operating within its specified limits. Operating the detector outside of its limits could cause performance problems or functional failure. 10.5. Bump Test Procedure Bump testing involves applying test gas to the detector and observing the readings from it. Readings should be obtained either from the detector's display or the controller display. - Page 30 D-Guard Connect the hose to the target gas cylinder regulator outlet. Observe all safety procedures surrounding the use of the gas. Turn on the gas and allow to run for about 60 seconds Observe the detector response (target gas still running). ...
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Page 31: Detector Operating System
D-Guard Detector Operating System D-Guard is shipped with the gas type and range configured per the end users requirements when purchased. In general, since many of the gas related functional settings are common to many applications, D-Guard has been setup with the most commonly encountered configuration based on the selected gas type and range. -
Page 32: Home Screen Features
D-Guard 11.2. Home Screen Features The Home Screen is the main display that will be visible most of the time during normal detector operation. There are a number of functions indicated on the Home Screen in addition to the gas readout. User Menu Status Gas Type And Range Gas Concentration Reading... -
Page 33: Configuration And Calibration Menu Navigation System
D-Guard 11.3. Configuration and Calibration Menu Navigation System D-Guard uses a soft-key navigation system to allow fast access to various detector configuration and calibration functions. Depending on the context of the configuration or calibration screen being accessed, the four keys will have specific actions assigned to them. -
Page 34: Quick-Nav Function
D-Guard 11.3.2 Quick-Nav Function To save the user from having to navigate past a large number of function screens to get to the desired page, a quick navigation system allow a direct jump to the general area of interest. If no key is pressed, the home screen is automatically returned to after 20 seconds. -
Page 35: Calibration
Some environmental standards mandate that detectors must be calibrated regularly if the monitoring system is to remain compliant with its rules. Gastech recommends calibration at 3 monthly intervals for a detector operating under normal conditions. 12.2. Preparing for calibration The method for calibrating the detector has similarities to bump testing. -
Page 36: Zero Calibration
D-Guard 12.3. Zero Calibration Zero calibration consists of applying a purge gas (i.e. a gas that does not contain any trace of the detector's intended target gas) and adjusting the detectors response accordingly. The output response of the detector is both the displayed value and the value of the current output on the current loop system. -
Page 37: Saving The Zero Calibration Value
D-Guard 12.3.2 Saving the Zero Calibration Value 12.3.3 Manual Zero Calibration Once an auto-zero has successfully completed, the 'save' icon If a manual adjustment of the baseline is required after an will show in the top right soft-key location. Operating the save auto-zero completes, the up and down soft-keys will increase key will store the zero calibration values and immediately start or decrease the baseline reading. -
Page 38: Auto Span Calibration
D-Guard 12.4.1 Auto Span Calibration After entering the calibration system The 'Calibrate Span' information page is now shown When entering the calibration functions, the zero calibration This page provides information and guidance on using the page is the first one seen. Operate the 'Span Cal' soft-key to span calibration functions available. -
Page 39: Saving Auto-Span Calibration Values
D-Guard Auto Span Fail Message 12.4.2 Saving Auto-Span Calibration Values If D-Guard has determined that an auto-span is not possible, Once an auto-span has successfully completed (or a manual the up and down soft-keys will become enabled, allowing a change is made due to a noisy sensor preventing auto-span manual span adjustment to be made. -
Page 40: Current Loop Output Calibration
D-Guard 12.5. Current Loop Output Calibration The current loop output signal is not expected to require re-adjustment under normal operating conditions.. If however setting is required, the following procedure describes the process. After entering the calibration system Bottom left ('next') soft-key moves to the next screen From the zero calibration page, operate the 'Span Cal' soft-key The second screen is span calibration . -
Page 41: Dynamic Response Time Test Function
D-Guard 12.6. Dynamic Response Time Test Function The Dynamic Response Time (DRT) test function allow the operator to perform a check on the actual gas measurement response time for the detector. Unlike a 'static' calibration where the adjustments are made to bring the readings to an expected steady state calibrated value, DRT dynamically checks the time taken for the gas reading to reach both 50% and 90% of the applied gas value. -
Page 42: Detector Configuration
D-Guard Detector Configuration As supplied to the end user, D-Guard is configured based on the selected gas type and range. For the majority of applications most of these 'default' settings should not require adjustment. The system of configuration menu screens works essentially the same way as those used for the calibration functions. Navigation uses the same general soft-key layout and the format of the screens is the same as for calibration functions. -
Page 43: Set Measurement Full-Scale
This setting is intended to be used by end users ONLY if they are competent* to do so. Changing this setting must only be carried out on advice from GasTech service engineers or authorised representatives. Changing the detector to a different gas type without changing the sensor type to match will result in incorrect detector operation or malfunction. -
Page 44: Setting Span Gas Concentration
D-Guard 13.1.4 Setting Span Gas Concentration This setting allows the user to enter the gas concentration value being used to calibrate the D-Guard D-Guard is shipped with a default value that relates to the gas range selected. This value may be set to match the most commonly used concentration value that the user will present to the detector during span calibrations and DRT tests. -
Page 45: Making Alarm Configuration Changes (Alarm 1 Shown)
D-Guard 13.2.1 Making Alarm Configuration Changes (Alarm 1 shown) Unlocked Menu System Screen Quick-Nav Screen To Enter the relay setup screens, start by unlocking the menu Once in the 'Quick-Nav' screen, operate the 'ALARMS' soft-key system. Hold the magnetic stylus over padlock icon for 5 to move to Alarm 1 Setup start page. -
Page 46: Alarm 1 Trip Direction
D-Guard Alarm 1 Hysteresis Adjusted 13.2.4 Alarm 1 Trip Direction Once a change has been made, the 'BACK' arrow icon will be Alarm trip direction may be set either Rising (RISE) or falling replaced by the 'save' icon. Operating the save soft-key will (FALL) and sets when the alarm should become active in commit the changes to the detector's configuration memory. -
Page 47: Alarm 2 Current Settings Screen
D-Guard Alarm 1 Latching Changed 13.2.7 Alarm 2 Current Settings Screen Once a change has been made, the 'BACK' arrow icon will be All settings for Alarm 1 also relate to Alarm 2 and are replaced by the 'save' icon. Operating the save soft-key will adjusted in the same way as described for Alarm 1. -
Page 48: Hart Tag Data
D-Guard The default state for HART communications is OFF. Once a change is made the save icon will show. Operate the Use the up or down soft-keys to toggle the setting between 'save' soft-key to commit the changes to configuration 'ON and 'OFF'. -
Page 49: Internal Temperature Sensor
The ‘gain’ of the sensor processing electronics may be Changing this setting requires an understanding of sensor signal levels. Please consult Gastech for advice on when and adjusted to 7 different values. As supplied, the gain is optimal for the sensor fitted and the gas range selected. -
Page 50: Set Menu Passcode
D-Guard 13.4.7 Set Menu Passcode Access to the detector’s menu system can be protected via the Once a digit is changed, the save icon will show to allow the use of a 4-digit passcode. The default passcode is 0000 which change to be recorded. -
Page 51: Detector Fault - Upper Operating Temperature
Detector Information Screen The detector information screen contains the units serial number, the date of manufacture, hardware and firmware revisions and Gastech company information. Every fault event that occurs within the detector is added to the 14.2.3 Resetting the Detector Life Counter fault list. -
Page 52: Calibration Fault
To clear this warning, try recalibrating or reconfiguring the detector. If these steps do not clear the fault, please call Gastech for advice. Alarm Indication 15.1.1 Warn Alarm Indication 15.1.2... -
Page 53: Temporarily Silencing An Alarm
D-Guard 15.1.5 Temporarily Silencing An Alarm 15.1.6 Clearing An Alarm State It is occasionally required to temporarily 'silence' an alarm for If an alarm has been triggered and the detector is set to latched conditions where an alarm event has been noted and is being alarm mode, the alarms can be cleared by using the alarm clear dealt with. -
Page 54: Connecting A Hart Field Communicator
HART communications, refer to the D-Guard HART specification document (This document is available from the Gastech website www.gastech.com.au). Remove the waterproof cap to access the communications port. Note that the detector is rated IP68 ONLY if this cap or the... -
Page 55: Detector Maintenance
D-Guard 17. Detector Maintenance Under normal operating conditions, D-Guard requires minimal maintenance above any scheduled service as set by local site regulations. 17.1. Visual Inspection Basic visual inspection focuses on looking at the physical installation for signs of damage, water or dust ingress and the condition of cables and labels. -
Page 56: Gas Sensing Cell Replacement
Infra-Red sensors, although more likely to last several years, may become unserviceable due to contamination. Once this occurs, the sensing element will need replacement. Sensor replacement must only be carried out by Gastech service staff or Gastech appointed agents with the appropriate training. -
Page 57: General Detector Repair
If a fault develops, the detector must be returned to Gastech for repair. It is essential that no attempt is made to repair a faulty detector by the end user since this may compromise the safety of the unit resulting in potential operational hazards that may endanger the life of personnel. -
Page 58: Output Current Signal - Total Loop Resistance Vs Power Supply Voltage
D-Guard APPENDIX A: 18.1. Output Current Signal - Total Loop Resistance vs Power Supply Voltage The maximum total current loop load resistance that can be driven by D-Guard depends on the voltage supply fed to the detector. This total resistance includes all aspects of an installation such as barrier resistance, cable resistance / length and the value of the sense resistor used at any connected controller's input channel. -
Page 59: Relay Board And Sounder Options
D-Guard 19. APPENDIX 19.1. Relay Board and Sounder Options. The D-Guard G can be ordered with an optional relay board (D-Guard R, part number: 65-1080R-xxx) which provides the option for standalone operation. Additionally, The D-Guard G can be ordered with an optional relay board and sounder combination (D-Guard S, part number: 65-1080S-xxx). -
Page 60: Table Of Functions (Identified By Silk Screen Legend On Relay Board And Photo Annotations)
D-Guard 19.1.2 Table of Functions (identified by silk screen legend on relay board and photo annotations) Function Description Supplies power to the relay board and the detector main circuit board. Connect to positive side of the power supply. Current loop output signal (sourcing type output). FB (feedback) Connect to an external controller input that has an input shunt sense resistor. -
Page 61: Relay Board Connections
D-Guard 19.2. Relay Board Connections 19.2.1 Current Loop Connection Scheme Relay Board Connection Current loop configuration 19.2.2 Stand-Alone Connection Scheme Relay Board Connection Standalone configuration Connect to Siren... -
Page 62: Disabling The Display Backlight
D-Guard APPENDIX C: 20.1. Disabling the Display Backlight By default, the display backlight is enabled for Group II versions of D-Guard and disabled for Group I versions. The backlight LEDs, when enabled create a voltage drop of around 3.0V in the power supply fed to the internal electronics. -
Page 63: Chemical Compatibility
D-Guard APPENDIX D: 21.1. CHEMICAL COMPATIBILITY When installing D-Guard , it is important to be aware of the possible effects of chemicals on the construction of the detector. Such effects may not be immediately noticeable, but may over time cause significant deterioration of the enclosure. -
Page 64: Cross Sensitivity - Toxic Sensors
D-Guard APPENDIX E: 22.1. Cross Sensitivity - Toxic Sensors By varying the material construction of the electro-chemical cells, sensors can be optimised towards different gas types along with differing sensitivities. An important point to note however, is that , for any given gas sensing cell type, even though optimised for a particular target gas, there may be sensitivity to other gases. -
Page 65: Environmental Effects On Detector Performance
D-Guard APPENDIX F: 23.1. Environmental Effects on Detector Performance Environmental changes in temperature, pressure and humidity can alter the performance of the sensing elements within D-Guard 23.2. Temperature The use of inherently stable electronics and built-in software routines provide compensation for static or slow moving changes in ambient temperature. -
Page 66: System Menu Map
D-Guard APPENDIX G: 24.1. System Menu Map... -
Page 67: Performance Specifications
D-Guard APPENDIX H: 25.1. Performance Specifications 25.1.1 General Specifications Limits Parameter Description / Conditions Units GS-1 Measurement Techniques Electro-Chemical Cell, Infra-Red. GS-2 Target Gas Depends upon model (see table 2 – gas types and ranges). GS-3 Full Scale Ranges Depends upon model (see table 2 – gas types and ranges). GS-4 Measurement Accuracy Refer to Sensor Performance tables. -
Page 68: Carbon Dioxide Detector Specifications
D-Guard 25.1.3 Carbon Dioxide Detector Specifications Parameter Specification CSS-1 Gas Type Carbon Dioxide INFRA-RED CSS-2 Detection ranges 0 – 1.5% v/v CSS-3 Sensor technology NDIR Infra-Red CSS-4 Sensor Size 20mm diameter CSS-5 Sensor Life >10 Years CSS-6 Calibration method 2 point, zero, full-scale CSS-7 Accuracy (scale and linearity) To AS2290.3, ANZ60079.29 and AS4641...